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Best Answer: Natural selection can increase the frequencies of alleles if they are advantageous to a species' survival and reproductive abilities.If they somehow produce a phenotype that is not a selective advantage, their frequency will decrease.lleles that give an organism a better chance of survival in their environment, better chance of reproduction, will become more frequent in a population. EX. There are dark and light moths in an environment.
Frequencyâdependent selection occurs when the fitness of a genotype depends on whether it is rare or common, that is, an individual's fitness is affected by allele or genotype frequencies of other individuals in the same population.